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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/ExtendableCookieChangeEvent below:

ExtendableCookieChangeEvent - Web APIs | MDN

Baseline 2025 *

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Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is only available in Service Workers.

The ExtendableCookieChangeEvent interface of the Cookie Store API is the event type passed to cookiechange event fired at the ServiceWorkerGlobalScope when any cookie changes occur which match the service worker's cookie change subscription list. A cookie change event consists of a cookie and a type (either "changed" or "deleted").

Cookie changes that cause the ExtendableCookieChangeEvent to be dispatched are:

• A cookie is newly created and not immediately removed, or if a cookies is replaced. In this case type is "changed".
• A cookie is newly created and immediately removed. In this case type is "deleted"
• A cookie is removed. In this case type is "deleted".

ExtendableCookieChangeEvent()

Creates a new ExtendableCookieChangeEvent.

This interface also inherits properties from ExtendableEvent.

ExtendableCookieChangeEvent.changed Read only

Returns an array containing the changed cookies.

ExtendableCookieChangeEvent.deleted Read only

Returns an array containing the deleted cookies.

This interface also inherits methods from ExtendableEvent.

In the below example, we use CookieStoreManager.getSubscriptions() to get a list of existing subscriptions. (In service workers, a subscription is required in order to listen for events.) We unsubscribe from existing subscriptions using CookieStoreManager.unsubscribe(), then subscribe to the cookie with a name of 'COOKIE_NAME' using CookieStoreManager.subscribe(). If that cookie is changed, the event listener logs the event to the console. This will be an ExtendableCookieChangeEvent object, with the changed or deleted property containing the modified cookie.

self.addEventListener("activate", (event) => {
  event.waitUntil(async () => {
    const subscriptions = await self.registration.cookies.getSubscriptions();

    await self.registration.cookies.unsubscribe(subscriptions);

    await self.registration.cookies.subscribe([
      {
        name: "COOKIE_NAME",
      },
    ]);
  });
});

self.addEventListener("cookiechange", (event) => {
  console.log(event);
});

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